Gypsum bearing face material of wooden building, bearing wall structure, and bearing wall construction method

A gypsum-based load-bearing surface material with inorganic fibers and organic strength-improving materials increases the wall factor by improving toughness and deformation compliance, addressing the challenges of manufacturing and construction complexity and weight in wooden buildings.

JP2025148572APending Publication Date: 2025-10-07YOSHINO GYPSUM CO LTD
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Patent Information

Application Number
JP2025121819
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2020-04-06
Filing Date
2025-07-22
Publication Date
2025-10-07

AI Technical Summary

Technical Problem

Existing gypsum-based load-bearing wall structures in wooden buildings require additional reinforcing or stiffening materials to increase wall factor, which complicates manufacturing and construction, and increasing specific gravity and thickness is impractical due to weight and workability issues.

Method used

A gypsum-based load-bearing surface material composed of a plate-shaped gypsum hardened body blended with inorganic fibers and organic strength-improving materials, covered with paper on both sides, maintains nail lateral resistance while reducing surface density to enhance toughness and deformation compliance, thereby increasing the wall factor without additional reinforcement or thickness.

Benefits of technology

The solution improves the wall factor by enhancing ultimate strength and deformation compliance, allowing for easier manufacturing and construction with reduced weight and thickness, without the need for additional reinforcing materials.

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Abstract

To enlarge a wall magnification of a wooden bearing wall without mounting a reinforcer or a stiffener additionally and without increasing the specific gravity and / or board thickness of a gypsum face material.SOLUTION: A gypsum bearing face material for a wooden bearing wall comprises a main material or a core material constituting a tabular hardened gypsum body having an inorganic fiber and an organic strength improver so as to exert a nail lateral resistance equal to or greater than 500 N, and a paper member covering at least front and rear surfaces of the main material or the core material. This bearing face material has an area density in a range of 6.5-8.9 kg / m2, shows an ultimate displacement (δu2) greater than 20×10-3 rad in an in-plane shear test and exerts an ultimate strength (a correction value) (Pu') greater than 7.6 kN. The wooden bearing wall using this bearing face material can achieve a short period reference shear capacity (P0) greater than that of the wooden bearing wall using the same type of the bearing face material having the area density equal to or greater than 9.0 kg / m2.SELECTED DRAWING: Figure 5
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